HELP: VOLUME GONE/DECREASE WITH BLEND CENTRED.

[bassdude73]

Hi,
I wired My barts with Volume ,Blend.
When the blend is centred..there is a drastic volume drop when compared to blend is fully clockwise or fully counterclockwise.
I knew nothing about electronic laws, so I was hoping the electronic gurus here can give me a hint,what might be the problem,what to check,etc.
BTW, the barts are M56CBC..with 5 wires..red,white,green,black and shield.
thanks
regards
/adrian

 

[Derek Balonek]

I'm assuming you're using a passive setup? That's something common to blend pots, but I really don't know why. I do know how to fix it, though: just don't connect the ground lugs of the blend pot. With those disconnected, the pot is just acting like a dimmer, instead of shunting part of the signal to ground. Oh yeah, and make sure it's a 500k pot, a 250k might not dim the pickups enough.

 

[mmbongo]

Sounds like one may be out of phase. Double check your wiring and make sure you don't have the ground and hot reversed on one of them.

 

[line6man]

That's something common to blend pots, but I really don't know why.

When a blend pot is at the center position, usually the pickups are directly parallel to each other with no resistance between them. This causes an impedance drop which reduces the volume.